I cant contact to web support 403 forbidden appears does anybody know why

Hello!

Here's how to downgrade your iCloud plan: Downgrade your iCloud storage

For the battery replacement, locate an Apple Authorised Service Provider: Apple - Find Locations

There is no phone support in Argentina, so I believe that is the reason for the 403 error: Contact Apple for support and service

I believe it would be better to try and get a newer phone if possible, as the iPhone 5s is almost 7 years old and does not run the latest version of iOS.

Hello!

Have you tried on more than one device?

What country are you in? Errors can sometimes appear due to Apple Support being unavailable in your country.

What issue are you having with your device? Someone in the community might be able to suggest some things to try.

Hello!

What issue are you having with your iPhone?